I was put on Atenolol for tachycardia and high blood pressure after undergoing thyroid surgery for toxic nodules. I keep reading about how certain antacids can cause your blood pressure to go up. I have GERD and am experiencing esophagitis again, and I would like to be able to take something for it. Is Zantac75 okay to take with a beta-blocker? And will it increase my blood pressure? I can't seem to find good information anywhere on the internet or even from my endocrinologist. Please help!